Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1218, Issue 38, Pages 6621-6629Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2011.07.102
Keywords
Ultrasound-assisted ionic liquid dispersive; Liquid-liquid microextraction; Pyrethroids; Liquid chromatography; Ionic liquid
Funding
- Natural Science Foundation of PR China [20977112]
- Program for New Century Excellent Talents in University
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This research paper presents a comparative study of the performance of conventional, ultrasound-assisted (UA), and temperature-controlled (TC) ionic liquid (IL) dispersive liquid-phase microextraction (IL-DLLME). Various parameters that affect extraction efficiency, such as type and volume of extraction and disperser solvent, centrifugation time, salt addition, effect of temperature on TC-IL-DLLME, and effect of sonication time on UA-IL-DLLME, were evaluated. UA-IL-DLLME was found to provide the best extraction efficiency. Under optimized conditions, great enrichment factors (506-515) and good recoveries (101.2-103.0%) were obtained by analyte extraction in real samples. The limit of detections (LODs) ranged from 0.21 to 0.38 mu g L-1. Good linearity was obtained in the range of 0.5-200 mu g L-1 for ethofenprox and tetramethrin, and 1-200 mu g L-1 for meperfluthrin and alpha-cypermethrin. Based on optimized conditions, the UA-IL-DLLME method was applied and combined with high-performance liquid chromatography with diode array detection (HPLC-DAD) to determine the presence of ethofenprox, tetramethrin, meperfluthrin, and alpha-cypermethrin in honey samples. (C) 2011 Elsevier B.V. All rights reserved.
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